import { NextResponse } from 'next/server';
import { saveUser, findUser, hashPassword, createSession } from '@/lib/auth';
import { randomUUID } from 'crypto';

export async function POST(req: Request) {
  try {
    const { username, password, chatId } = await req.json();

    if (!username || !password || !chatId) {
      return NextResponse.json({ error: 'Faltan datos requeridos' }, { status: 400 });
    }

    if (findUser(username)) {
      return NextResponse.json({ error: 'El usuario ya existe' }, { status: 409 });
    }

    // Hash password
    const passwordHash = await hashPassword(password);
    
    // Get IP
    const ip = req.headers.get('x-forwarded-for') || '127.0.0.1';

    const newUser = {
      id: randomUUID(),
      username,
      passwordHash,
      chatId,
      knownIps: [ip] // Register current IP as known initially
    };

    saveUser(newUser);

    // Auto login after register
    await createSession(newUser);

    return NextResponse.json({ success: true });
  } catch (error) {
    console.error('Register error:', error);
    return NextResponse.json({ error: 'Error interno del servidor' }, { status: 500 });
  }
}